drop if (exporter=="ELS" | importer=="ELS")
drop if (exporter=="GUA" | importer=="GUA")
drop if (exporter=="GUY" | importer=="GUY")
drop if (exporter=="TNT" | importer=="TNT")
drop if (exporter=="TOG" | importer=="TOG")
drop if (exporter=="HAI" | importer=="HAI")
drop if (exporter=="COR" | importer=="COR")
drop if (exporter=="CYP" | importer=="CYP")
drop if (exporter=="DRP" | importer=="DRP")
drop if (exporter=="ECU" | importer=="ECU")
drop if (exporter=="MAL" | importer=="MAL")
drop if (exporter=="NIR" | importer=="NIR")
drop if (exporter=="PAN" | importer=="PAN")
drop if (exporter=="PER" | importer=="PER")
drop if (exporter=="MAU" | importer=="MAU")
drop if (exporter=="MAW" | importer=="MAW")
drop if (exporter=="MOR" | importer=="MOR")
drop if (exporter=="NEP" | importer=="NEP")
drop if (exporter=="PHI" | importer=="PHI")
drop if (exporter=="SEN" | importer=="SEN")
drop if (exporter=="SUD" | importer=="SUD")
drop if (exporter=="ZAM" | importer=="ZAM")
